New Delhi: Country's largest public sector refiner Indian Oil Corporation (IOC) plans to hive off hydrogen producing units and sulphur recovery facilities at its refineries to a separate entity and then sell stakes in it to the private sector to raise close to Rs 10,000 crore.Government expects Indian Oil, GAIL and Hindustan Petroleum to raise Rs 17,000 crore by selling stakes in their pipelines through the infrastructure investment trust route in the next financial year.